*{
    padding: 0;
    margin: 0;
}
body{
    background-color: rgba(0, 0, 0, 0.1);
}
.app{
    display: flex;
    flex-direction: row;
    width:1260px;
    .left_side{
        display: flex;
        flex-direction: column;
        justify-content: start;
        align-items: center;
        width: 15%;
        height: 100vh;
        background-color: rgba(39, 39, 39, 0.9);
        .change_meal_button{
            width: 100%;
            height: 50px;
            margin: 10px 0;
            border-style: none;
            background-color: rgba(39, 39, 39, 0);
            color: #f5f5f5;
            font-size: 20px;
        }
        .change_meal_button:hover{
            background-color: rgba(0, 0, 0, 0.1);
        }
    }
    
    .right_side{
        display: flex;
        flex-direction: row;
        justify-content: center;
        align-items: center;
        width: 75%;
        .roulette{
            display: flex;
            flex-direction: row;
            flex-wrap: wrap;
            width: 300px;
            height: 300px;
            .single_roulette{
                display: flex;
                flex-direction: column;
                justify-content: center;
                width: 98px;
                height: 98px;
                background-color: rgba(0, 0, 0, 0.1);
                border: 1px solid #f5f5f5 ;
                h1{
                    text-align: center;
                    font-size: 20px;
                }
            }
            .active{
                background-color: rgba(0, 0, 0, 0.8);;
            }
        }
        
        // 开始按钮
        .start{
            width: 300px;
            height: 100px;
            margin-top: 50px;
            border-style: none;
            border: 1px solid #f5f5f5 ;
            background-color: rgba(0, 0, 0, 0.1);
            font-size: 50px;
            text-align: center;
        }
    }
}
